Method for preparing polybutadiene latex

Abstract

A method for preparing a polybutadiene latex comprises providing an emulsion polymerization medium by reacting a mixture of water, butadiene monomers, a surfactant, a chain transfer agent, an initiator and an electrolyte, preferably at a temperature of about 60~80° C., preferably for about 8~16 hours, and agglomerating the resulting emulsion polymerization medium, preferably at a temperature of about 5~20° C. higher than the polymerization temperature, preferably for about 4~12 hours by adding a surfactant and an agglomerating agent to the emulsion polymerization medium in consecutive order. The agglomerating agent is prepared a method comprising a first step of forming agglomerating seeds by batch polymerization of an alkyl acrylate of C1~C12, an anionic surfactant and an anionic initiator, a second step of growing the agglomerating agent in semi-batch polymerization by adding an alkyl acrylate of C1~C12 and anionic comonomer to the resulting polymer of the first step, and a third step of copolymerizing the ionic comonomer at the surface of the agglomerating agent to be prepared in a sufficient amount, by adding an alkyl acrylate of C1~C12, an ionic comonomer and an anionic initiator to the resulting polymer of the second step.

Description

The present invention relates to methods for preparing a polybutadiene latex. More particularly, the present invention relates to methods for preparing a polybutadiene latex, which can reduce reaction times in polymerization of butadiene and agglomeration of polybutadiene when a polybutadiene latex is produced.Also, the present invention includes an agglomerating agent for effectively agglomerating polybutadiene latices, and methods for preparing the agglomerating agent.In general, rubbery latex is used in preparation of impact-resistant resin compositions for improving impact strength thereof. An agglomerating agent is used for preparing the rubbery latex. Various methods for agglomerating rubbery latices have been employed up to now.For example, in preparation of ABS resin which is impact-resistant, the resin is prepared by agglomerating polybutadiene rubber particles with an agglomerating agent, graft-polymerizing monomers of styrene and acrylonitrile onto the polybutadiene latex...

AI Technical Summary

Benefits of technology

The methods for preparing polybutadiene latex according to the present invention have effects of the invention, which can provide polybutadiene latex having an increased particle size at a certain reaction temperature and solids content, and improve productivity of polybutadiene latex by shortening reaction times in polymerization of butadiene and agglomeration of polybutadiene.

, which can provide polybutadiene latex having an increased particle size at a certain reaction temperature and solids content, and improve productivity of polybutadiene latex by shortening reaction times in polymerization of butadiene and agglomeration of polybutadiene.

The invention may be better understood by reference to the following examples which are intended for purposes of illustration and are not to be construed as in any way limiting the scope of the present invention, which is defined in the claims appended hereto.

Problems solved by technology

However, the process does not form uniform cores, and provides latex particles having a large distribution of particle size.

Considering the reaction temperature and solids content of a rubber latex, conventional methods cannot produce rubber latex having an increased particle size.

Particularly, when a certain solids content of rubber latex is to obtain, the reaction times are long, which is uneconomical in the production of rubber latex.